'context' keyword is stripped out from request body

[ayZagen]

Describe the bug

• Node.js version: 12.11.0
• OS & version: ubuntu 18.04
• got version: 10.0.0-alpha.2.2

context key is stripped from body.

Actual behavior

when we include context in our request body it is stripped out from outgoing request.
...

Code to reproduce

const got = require('got');
(async () => {
  let resp;
  try {

    resp = await got('http://google.com',{
      method : 'POST',
      json   : {
        context : { a: 'test'},
        a       : { b: 'asdasd'}
      }
    });
  } catch (e) {
    console.log(JSON.parse(e.options.body));
  }

  console.log(resp);
})();

Checklist

• I have read the documentation.
• I have tried my code with the latest version of Node.js and Got.

[ayZagen]

culprit is at merge.ts. Is it really necessary to check context in every source ?

[sindresorhus]

I think the problem is that json, body, form, should not be passed through merge.ts at all. @szmarczak would know more.

I've added a failing test for this: cb042ac

[szmarczak]

I'll investigate ASAP